クラブラン酸

-2.3

-1.5

117.5-118

117.5 - 118 °C

Clavulanic acid, when administered with amoxicillin, can cause some mild gastrointestinal adverse effects. These include vomiting, nausea, loose stools, and discomfort. Antibiotic-associated diarrhea due to amoxicillin-clavulanic acid treatment is the most common adverse effect. There is a higher incidence of diarrhea when clavulanic acid is added to amoxicillin compared to amoxicillin alone. Diarrhea is more common in those taking a high dose of the extended-release form of clavulanic acid and amoxicillin. Drug-induced pancreatitis from clavulanic acid and amoxicillin has occurred in a few cases.；When used for the treatment of urinary tract infections, this drug combination can cause candida vaginitis. Amoxicillin, in conjunction with clavulanic acid, is the most common cause of idiosyncratic drug-induced injury, specifically cholestatic liver injury, and this can lead to an increase in alkaline phosphatase and bilirubin levels. Since clavulanic acid administration is always in conjunction with amoxicillin, it is important to consider the adverse effects of amoxicillin alone as well. Hypersensitivity reactions to this drug combination, usually due to amoxicillin, can occur and result in dermatological reactions. Still, none of these allergic reactions are known to be due to clavulanic acid alone.

The toxicity of clavulanic acid alone is unknown. However, the toxic effects of amoxicillin/clavulanate have been reported. The most common toxic effect is an idiosyncratic drug-induced hepatic injury which leads to a mixed hepatocellular-cholestatic injury, and it is more common in older men. Amoxicillin-clavulanic acid is the most common cause of idiosyncratic drug-induced hepatic injury. Risk factors for hepatic injury include sex, cytochrome P450, and genetic polymorphisms. These risk factors should be examined before administering amoxicillin/clavulanate to reduce the risk of toxic and adverse effects. In addition to early diagnosis and discontinuation of the drug, N-acetylcysteine can be administered to minimize damage. Additionally, steroids can be given to decrease the time it takes to return hepatic enzymes and bilirubin levels to normal. Liver failure is also a rare but possible toxic effect of amoxicillin-clavulanic acid.

Clavulanic acid inactivates some beta-lactamase enzymes that are produced by bacteria, therefore preventing enzymatic destruction of amoxicillin. This helps to treat a variety of bacterial infections which would otherwise be resistant to antibiotics without the addition of clavulanic acid.

Clavulanic acid contains a beta-lactam ring in its structure that binds in an irreversible fashion to beta-lactamases, preventing them from inactivating certain beta-lactam antibiotics, with efficacy in treating susceptible gram-positive and gram-negative infections.

Clavulanic acid is heavily metabolized to form the metabolites 2,5-dihydro-4-(2- hydroxyethyl)-5-oxo-1H-pyrrole-3-carboxylic acid and 1-amino-4-hydroxy-butan-2-one. The first metabolite was found to account for 15.6% of the dose while the second metabolite was reported to account for 8.8% of the dose in one pharmacokinetic study.

23521W1S24

CLAVULANIC ACID

Established Pharmacologic Class [EPC] - beta Lactamase Inhibitor

Mechanisms of Action [MoA] - beta Lactamase Inhibitors

Clavulanic acid is a beta Lactamase Inhibitor. The mechanism of action of clavulanic acid is as a beta Lactamase Inhibitor.